#include <stdlib.h>
#include <stdio.h>

static char *p;

static unsigned
parse (int c)
{
 again:
  while (*p == ' ' || *p == '\t')
    p++;
  switch (*p++)
    {
    case 'V':
      return 1;

    case 'U':
      if (c == 0)
	return parse (0) + parse (0);
      else
	{
	  unsigned v, w;

	  v = parse (1);
	  w = parse (1);
	  if (v < w)
	    v = w;
	  return v;
	}

    case 'C':
      c = !c;
      goto again;

    default:
      abort ();
    }
}

int
main (void)
{
  char *buf;
 
  buf = malloc (327680);
  while (gets (buf) != NULL && *buf != 0)
    {
      p = buf;
      printf ("%u\n", parse (0));
    }
  return EXIT_SUCCESS;
}